How to delete contacts in old iphone? - 1

I had an iphone 4 And I just bought an iphone 5. I cut the micro sim to nanosim into the iphone 5. I restored the iphone 4's backup to the iphone 5 through itunes in pc. Now i have my contacts both in my old and new iphone but i'm going to give the old iphone to my sis. I imessaged my friend from iphone 5 but it also comes up in the old iphone. So how do i imessage my friends in thw new iphone without going through the old iphone? I want my privacy. Please answer as soon as possible.

You need to do a full reset to clear all your information off the phone.

Go to Settings > General > Reset > Erase all contents and settings.

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